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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bd612e9cb3277fafdb0e242f1b0ec295ae96649e7db4da28327cb25a3255f012' 
  AND token = '59TYArSXf2Oox4KxEmVzaEuG2btCYthZHoWJDoiqETQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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