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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b91620bce368ea14838b7789e678b6f56b7b46c8318a0888380b8726d2ac9c1e' 
  AND token = '+DEcaLArtGZZhoFI/TMBY/v7DOIJ+6qlMg5erPxxkT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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