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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c2f17aaddcc32bc0ec9ec644d4f6cc29a77f0d0b5e5faeb215298d8dadd89864' 
  AND token = '701SlgofOkmaNB3+Is+0H929g/cVITSLry84EZFc7tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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