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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c0fb51e7997400d99e01be89d6a2aabbdbe5f4d9c127a473327283345cc2668' 
  AND token = 'l1kE4eNH0Szd1EVIb2wndSzEQ8WCJcZTGPTBMMtSOak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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