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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5dc7268ca3c079941cc25399ac8ce88442a149b7055fed0abc3987b30164f26c' 
  AND token = 't5QM16A+mzrQZ/SB9uf2pMxpi8ECbbsWbcSSi1GBTQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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