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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87013ee7ea1183aa9463500928efe2af9be32e519974f03472a2264590a0725d' 
  AND token = 'p7cuR4ykbJE5+RAoc0B621wF0iT+w0amLJupNh2s1cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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