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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd6b5370fc78e796de0878ea20763dc6453759bd557bd1a1f04f40731c4114ed' 
  AND token = 'OMnRep+D2FNlL08P5xUEwrG8h0EVNMgPTLPakv1dcVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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