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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c56f288ac30af6f95453a1cc877398611e35f5c11213551ae7d33d652b313c9c' 
  AND token = 'TH67jaBKc7qjHynUskPPqfeReFYHJslIOYdKYQfmPG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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