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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f7ffeae1ffc241ffe3f20b62d8a87de0ec728b04d203206267290c4e7dd08f27' 
  AND token = 'pq2Rf+39zlz9/jEvrQKdtLmWKl3rBEqiVsV66NcrIwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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