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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '538fd418a28413a28e8ec8db2a4cfd1cdee929e43a6cd757e901da0d57acd010' 
  AND token = 'gadIzu1dAcyKA2RUeI2ylPhQu4c/rbWpPy5l0PDHAlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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