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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e1e777557800412f4bf81b532a515ca5340bba97d3e8b28149c731b42bc1a1cb' 
  AND token = 'gNqylcyQBKE4612FKTUW7j2Stu5q3FbTaAVv9g1L420=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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