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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a982c6abfa958a5524f8dfd5aa0e0a615ee4f01c679beb4f5907f5e96059b2f0' 
  AND token = 'WURfxDYcpwINfxr6KBUBjrx8ilEsjXFObTOB95LjB9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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