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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5b49e90fdbbcbca0df769c5ad7a75241367c9c04644f59ec6add3f8e19a8529e' 
  AND token = 'Dr8clh545kpMIVZwDtFNP87Y+5ukCj6zcPMRf+Jx+EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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