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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8045dfdebad2ef5f6a7d446c9ee0d7563dd7eead3274ad52829020fed5a0a94c' 
  AND token = '9cEMA5aqGArmYgWk+JJLnKctMKIjdeUGFUBL2/kRvrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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