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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dffc6886ea5ad0b3b2550a0bb87635f5d65491b7b6554ca1bf4c6413786307e3' 
  AND token = 'mtQ2xZsGXu5IQ3j6DHGWB1sekFsQpEuV/M3hK6XZrnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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