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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e26daa4d82b019be675a4a7570f5a75f6078f344b4440fcad5875bad0dd3a3f5' 
  AND token = '7cobGD/6B3X61CTRRinjh2OBPk6g2Yjq26xrgdqbWxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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