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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f49c7b8fd98c5b5414bd59fbae9f0b2b7f49c488dfa18259a59d99fd10497f84' 
  AND token = 'Ir/VMEtiYfkJRXW/GvKlqGVrzOMiVzRCDb9WS5j61Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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