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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a51a153a525813942000d0c8cc4b7b778b99cdf03740e09258c1af0d233044db' 
  AND token = 'HvA3WWFu0x6+yqRLinqDvry9R7yu/CjVqxPWguOwI7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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