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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '526cdbede2724850d9956350832d7e28fcb18ff7c3f23e58a2627e5c98dfed0b' 
  AND token = 'AQ4HECZbYcltP1s2YW1z1GL0xjtXX9RDqM0N84yw7w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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