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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9a1c58ea4849d0653ff95bbaa2de6f3189d137a8b687d9eb46931a642763db0' 
  AND token = 'YbqsrM6gRO1Tqp5GMJ/Abrithaems9ixhT2uk+/8dkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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