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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '162e6aecc1defaca8e466b29fe383255512ebb79f39d4f006c720f7f24634790' 
  AND token = 'Wkxvjin/2MBLYmf4d4C69npKP+ubPFfRompE+dTOf6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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