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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '862875f06154b37ec8450eb92ff0721195553962834a0df6a2dbb3d8e4b87905' 
  AND token = 'hZCRn3IHIj+cP0pnT3Dzm6Gqfgc0+o885E40eaHL9Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}