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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee0980804fdd1931d0f3fcb8f7fbdeae13405b254087168449d4820804f852dc' 
  AND token = 'r74XglgcNH+cYx7Hmm1ByDEScx/N3ZwpulYKxEAbt0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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