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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd8ddcb3503868921caafc24fc8bce83cf42746c4eae63d00bf73718f2e54231c' 
  AND token = 'QwjzF3ALm6YikKK4nCmI2D8eVVNU47Dtseq2/7t6hyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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