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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '81151696efe526939ba896ae8da2d631d5cb9f01be1c434e5aefcda031d41d7d' 
  AND token = '6qrjLgeHUUHspFs/rRZ2D2U/iDNoQjrmrqG1LeIu+tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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