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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f72b5aea5e3a5e1537248adcad62c4474014b847f70f1faca5113067e627691d' 
  AND token = 'VNR2rpFFzl5pEbjCLP+bPLLn3Lz3JPXF2wuPRZwU3T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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