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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'de41a84111e3c19006700c40c048987549733e8840bfaa1257bc4a43cbb403e9' 
  AND token = '5vaOtNWv5qca2owKmMWFtxEPf7kuhtz7y2w96uvkqHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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