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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a050385e370cd346cf4c6601a70e23741a49eac65237a5c21f8dc9552e42179d' 
  AND token = 'W8Q+gqi4V8joAohmQDDO48j4OvKeavh2P4ZD6NTslcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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